Saw-mill dog



'ilNrrnn FFICE.

ArENr SAW-MILL DOG.

SPECIFICATION forming part of Letters Patent No. 290,355, dated December18, 1883.

Application filed October 6, 1883.

(No model.)

To all wiwm it may concern.-

Be it known that I, Josnrn REDLINE, J r., a citizen of the UnitedStates, residing at Rohrsburg, in the county of Columbia and State ofPennsylvania, have invented certain new and useful Improvements inSaw-Mill Dogs; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make'and use the same, referencebeing bad to the accompanying drawings, and to the letters and figuresof reference marked thereon, which form a part of this specification.

' My invention relates to improvements in saw-mill dogs; and it consistsin the construction, combination, and arrangement of the several parts,as will be hereinafter described and claimed.

In the drawings, Figure 1 is a perspective, and Figs. 2, 3, and 4 areside views, of my improved device, whichis composed of the bracket A,the plunger 13, the operatingdever O, and the pitman D, arranged andoperating as will be described.

The bracket is preferably formed of the base A and the standard A and isprovided with threaded openings a'to receive feed-screws, or with othersuitable means or constructions, whereby the dog and the log securedthereby may be moved forward, as is well understood. The standard A ispreferably mounted on or projected upward from the inner end of the baseA. The locking-plate B is provided on its forward edge with prongs B,which may be one in number, as shown in full lines, or two or more, asindicated in dotted lines. This plunger is provided with slots B formedthrough them, and cut to provide the lower inclined portion, 1); and theupper vertical portion, I), and the locking-plate and standard aresecured together by the pins a, projected from the latter through theslots B as shown. The slots 13 and pins a are so arranged that thelocking-plate, when elevated, will be back from the forward edge of thestandard, and the points of its prongs will be flush therewith, as shownin Fig. 3. Vhen' depressed, the forward edge of the locking-plate liesflush with the corresponding edge of the standard. As the locking-plateis depressed by the devices shown or other suitable devices, it will beseen that its motion and that of its prongs will at first be inclinedoutward anddownward, and that the prongs will. enter the log, which isheld against the dog, in a downwardlyslanting direction. The upper endsof the. slots 13" being vertical causes the latter part of thelocking-plates motion to be vertically downward, which causes a firm,secure bite of the prongs into the log, and a consequent stronger holdthereof than is attained by dogs of ordinary construction.

The lever O is pivoted to the standard at a point above thelocking-plate and preferably in vertical line with the pins a, and iscomposed of the handle a and the crank portion 0, bent at right anglesto each other. The outer end of the crank-arm 0 is pivoted to the upperend of the pitman D, which latter is pivoted at its lower end to thelocking-plate at a point near the rear edge of same and midway its upperand lower ends, as shown.

When the several parts are in the position shown in Fig. 3, the deviceis ready for operation. The locking-plate is elevated an 1 rests flushup against the side of the crank-arm of the lever. The log is now placedup against standard A and the lever is drawn over to the position shownin Figs. land 2. The locking-plate prongs are now embedded firmly intothe log, as before described,and the end of the crank-arm is thrownforward beyond avertical line drawn through the levers pivot and thepivot of the plunger and the pitman, and the said end of the crank-armbears down against the top of the locking-plate, which is thereby lockedfirmly in its position, as the crank-arm cannot swing farther forward,owing to the inclination of the lower portion of slots Bflwhich willprevent the plunger, and consequently the lower end of the pitman, frommoving forward. By throwing the end of the arm in advance of the leverand locking-plate pivots, is above, the involuntary movement of thelever backward is prevented, and the same is held firmly and steadily inthe position shown.

In order to relieve the several parts from strain when the crank-arm isthrown forward in its locking position, I prefer to secure the stop a onthe standard in the position shown. The arm 0 of the lever bears againstthis stop when moved forward, as shown in Fig. 1, and the breaking ofthe locking-plate pins a or the pitman or lever, when under heavy upwardpressure or sudden jars, is avoided.

I prefer, instead of the stop 0', to employ the construction shown inFig. 4. It consists in providing the pins a with heads a, projectedbeyond the locking-plate, so that the pitman will bear against saidheads and all forward straining will be prevented. It involves also thearrangement of the levers pivot slightly back out of line with the pinsa, as will be understood.

In order to hold the locking-plate up in the position shown in Fig. 3,Iprovide the springbar D, secured at one end to the back of lever C, andhaving its other end bowed, so as to engage pin (1, secured on thestandard, as clearly illustrated in the several views.

It will be understood that where so desired the slots B could be formedin the standard and the pins a projected from the lockingplate, alsothat the standard could be supported without the base A, and that suchmodifications would involve no departure from the principles of myimprovements.

The locking-plate is usually made of castiron and the prongs of steelsuitably secured to the locking-plate. The main object of my device, itwill be understood, is to securely hold the last board in the operationof sawing from a log.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. The saw-mill dog, substantially as described and shown, composed ofthe standard, the locking-plate having suitable prongs, and constructedwith slots having upper vertical and lower inclined portions, the pinspassed from the standard through said slots, the lever pivoted to thestandard above the lockingplate, and having its crank-arm turning downagainst the same, and the pitman connecting said crank-arm and thelocking-plate, all substantially as described, and for the purposesspecified.

2. The combination, in a saw-mill dog, of the locking-plate, thestandard, the lever, and the spring D, having one end secured to thelever and its opposite end engaging a pin secured on the standard,substantially as set forth.

3. In a saw-mill dog, the combination, with the standard and the toothedplate provided with guide-slots inclined upward and backward, andsliding upon guide-pins projected from the standard, of the lever O,pivoted on the upper end of the standard, and having the arm orextension 0 projected below its pivotal center and adapted to turninward over the upper end of the toothed plate, and the pitman D, havingits lower end pivoted on the rear edge of the toothed plate and itsupper end pivoted to the lower end of the extension c, the saidextension and the pitman being so arranged relatively that the pivotalconnecting-point between them will swing to or slightly past a linedrawn from the pivotal center of the lever and the pivotal center of thepitman, whereby the toothed plate will be securely locked, substantiallyas shown and described.

4. In a saw-mill dog, the combination of the standard, the locking-platehaving suitable prongs, and provided with slots having vertical andinclined wings, the pins passed from the standard through the saidslots, the lever pivoted to the standard above the locking plate, thepitman connecting the lever and the locking-plate, and means,substantially as described,whereby the forward movement of the lever islimited, as and for the purposes set forth.

5. In a saw-mill dog, substantially as described and shown, thecombination of the standard, the lockingplate provided with slots, pinsa, extended from the standard through the said slots, andhaving heads aprojected beyond the face of the locking-plates, the operating-leverpivoted to the standard above the locking-plate, and the pitmanconnecting the crank-arm of the lever and the lockingplate, and arrangedin rear of the heads a and abutting thereagainst in the operation of themachine, whereby the forward movement of the lever is limited,substantially as and for the purposes specified.

In testimony whereof I aiiix my signature in presence of two witnesses.

JOSEPH REDLINE, J R.

\Vitnesses:

J. W. FRIvnLPIncn, FRANK L. Hnss.

